Pat, your probably right. I was hoping maybe somebody has tested it before I buy another set of 2 1/4'' .i would say 2 1/4 with a n/a motor, because i think a little back pressure would be good.
Its a 533ci. n/a jet boat.What cubic inch?
Rex, have you actually tested this ??? Does more exhaust "scavaging" take place with the smaller pipe ? Just figured if there is gains to be made, the price difference is not much.2 1/4 will yield more HP on most any N/A engine unless it's a prostock or something very radical. 1 7/8" or 2" actually works better on most but they don't offer them any more since water injection came about.
I have not personally but have spoken with many who have over the years. 2" is generally considered about optimum (dry). When you add water 2 1/4" seems to work good. Note that all engines are different. If you have huge cam and heads you may need something larger. 2 1/2" on most N/A engines though would be considered too big. Only the dyno knows for sure on this though.Rex, have you actually tested this ??? Does more exhaust "scavaging" take place with the smaller pipe ? Just figured if there is gains to be made, the price difference is not much.